--- /dev/null
+// RUN: %clang -O0 -fenable-matrix -S -emit-llvm %s -o - | FileCheck %s
+// RUN: %clang -O1 -fenable-matrix -S -emit-llvm %s -o - | FileCheck %s
+// RUN: %clang -O2 -fenable-matrix -S -emit-llvm %s -o - | FileCheck %s
+// RUN: %clang -O3 -fenable-matrix -S -emit-llvm %s -o - | FileCheck %s
+// RUN: %clang -Ofast -fenable-matrix -S -emit-llvm %s -o - | FileCheck %s
+// RUN: %clang -Os -fenable-matrix -S -emit-llvm %s -o - | FileCheck %s
+// RUN: %clang -Oz -fenable-matrix -S -emit-llvm %s -o - | FileCheck %s
+
+// Smoke test that the matrix intrinsics are lowered at any optimisation level.
+
+typedef float m4x4_t __attribute__((matrix_type(4, 4)));
+
+m4x4_t f(m4x4_t a, m4x4_t b, m4x4_t c) {
+ //
+ // CHECK-LABEL: f(
+ // CHECK-NOT: @llvm.matrix
+ // CHECK: }
+ //
+ return a + b * c;
+}